Data Scientist

Job Title: Data Scientist Company: Commonwealth Bank of Australia Job Category: Machine Learning Roles & Responsibilities: As a Data Scientist in the team, you’ll help assess whether AI solutions perform as intended by independently evaluating their data, methodology, assumptions and outcomes. You’ll combine hands\-on technical investigation with clear, evidence\-based challenge, helping support safe and sustainable AI adoption. You’ll work closely with model developers, product owners and business stakeholders while maintaining the independence expected of a validation function. In this role, you will: * Independently deliver defined components of AI and ML validation, including technical analysis, testing and evaluation. * Review data, methodologies, assumptions and model outcomes, investigating unexpected behaviour and potential weaknesses. * Design and execute evaluations for Generative AI and agentic systems, including architectures involving RAG, tool use, guardrails, routing, memory and LLM\-as\-a\-Judge approaches. * Build reproducible test harnesses, reusable evaluations and automation that improve the efficiency and consistency of validation. * Navigate unfamiliar codebases, reproduce evaluation pipelines and inspect trace data to understand model and agent behaviour. * Provide constructive, evidence\-based technical challenge and bring your findings into broader validation conclusions. * Communicate complex technical findings clearly to both technical and non\-technical stakeholders. Share knowledge and contribute to the continuing development of AI validation practices, tooling and standards. * This role will suit a curious, hands\-on Data Scientist who enjoys getting beneath the surface of how AI systems behave. You’ll bring sound analytical judgement, attention to detail and the confidence to investigate unexpected results, while staying curious as Generative AI and agentic techniques continue to evolve. If you're already part of the Commonwealth Bank Group (including Bankwest, x15ventures), you'll need to apply through Sidekick to submit a valid application. We’re keen to support you with the next step in your career. We're aware of some accessibility issues on this site, particularly for screen reader users. We want to make finding your dream job as easy as possible, so if you require additional support please contact HR Direct on 1800 989 696\. Work Location: Sydney, NSW, Australia Availability: Full time

Experience across several of the following will help you succeed:* * Advanced Python skills and experience with GitHub, version control and CI/CD; SQL, R or TypeScript exposure is also valuable. * Experience with frameworks and tools such as LangChain, LangGraph, OpenAI Agents SDK, Pydantic and evaluation or observability platforms such as Langfuse or HoneyHive. * Practical knowledge of Generative AI and agentic architectures, including orchestrators, sub\-agents, RAG pipelines, tool use, guardrails, multi\-agent routing and memory. * Hands\-on experience building or evaluating AI and Generative AI solutions, including synthetic data; transformer fine\-tuning experience would be beneficial. * Experience using AI coding agents such as Claude Code or Codex, including building reusable skills, agents, hooks or plugins to automate technical workflows. * Working knowledge of traditional machine\-learning approaches such as regression, random forests and XGBoost, together with appropriate evaluation methods. * Confidence reading unfamiliar code, reproducing evaluation pipelines, writing test harnesses and analysing trace data. Strong communication skills and the ability to explain complex analysis and technical risks clearly to different audiences. * Key Skills: Machine Learning, Python Salary: Not disclosed